Silent-key mechanism.



PAT/ENTED DEC. 1, 1903;

M. KELLOGG. SILENT KEY MECHANISM.

APPLICATION FILED AUG. 29, 1903.

NO MODEL.

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PATENTED DEC. 1, 1903-.

M. KELLOG'G. SILENT KEY MECHANISM. APPLICATION-FILED AUG. 29, 1903.

2 SHEBTS-SHEIJT 2.

N0 MODEL.

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cam/[30W UNITED STATES Patented December 1, 1903.

PATENT OFFICE.

MILTON KELLOGG, OF CHICAGO, ILLINOIS, ASSIGNOHTO UNDERWOOD TYPEIVRITERCOMPANY, OF NE\V YORK, N. Y., A CORPORATION OF NEWV JERSEY.

SILENT-KEY MECHANISM.

QPECIFIGATION forming part of Letters Patent No. 745,356, dated December1, 1903.

Application filed August 29,1903. Serial No. 171,172. (No model To allwhom it may concern:

Be it known that I, MILTON KELLOGG, a citizen of the United States, anda resident of Chicago, countyof Cook, and State of Illinois, haveinvented certain new and useful Improvements in Silent- Key Mechanisms,of which the following is a specification.

My invention relates to silent-key mechanisms for type-writers and likemachines, and has for its object to provide a simple mechanism capableof ready attachment to existing type-writing machines.

The invention will be fully described hereinafter and the features ofnovelty pointed out in the accompanying claims.

Reference is to be had to the accompanying drawings, in which- Figure lis a sectional. elevation from front to rear of a type-writer embodyingmy invention. Fig. 2 is a plan with parts in section on line 2 2 of Fig.3, and Fig. 3 is a sectional elevation on line 3 3 of Fig. 2.

A indicates the frame of the type-writer; B, the carriage with theplaten O; D, one of the key-levers, which in this case belongs to one ofthe silent keys, said lever being fulcrumed at D and being returned toits normal position by a spring E. The connection of the key-lever Dwith the impression mechanism is effected in any suitable manneras, forinstance, by means of an elbow-lever F, fulcrumed at F and having twopin-and-slot connectionsone, F with the key-lever D, and the other, F,with the type-bar G, fulcrumed at G onthe' segment H.

'D is the silent key, and I is the space-key,

connected with levers J, carried by a rockshaft J, from which alsoextends an arm J engaging therock-arm K, fulcrumed at K,

which is connected with the escapement mech-- anism (not shown) in anysuitable manner.

It will be understood that the ordinary step-' the carriage being fedwhen the key D is depressed, I provide an arm L, arranged to be engagedand depressed by the key-lever D, as indicated in Fig. 1, the said armbeing secured upon a rock-shaft M, as by means of a set-screw M. Thisarm is provided at its lower portion with a cam-surface L, adapted toengage a rod N, secured to the levers J at a distance from theirfulcrum." In Figs. 2 and 3 I have shown three arms L, corresponding tothree silent keys. It will be understood that the set-screw connectionenables these arms to be adjusted along the rock-shaft M to any desiredposition.

The number of silent keys may of course vary. If there was only onesilent key located at the right, it would not be necessary to employ arod N extending from one lever J to the other, but it would besufficient to provide the projecting portionN', which is locatedeXteriorly of the right-hand lever J, as shown in Fig. 3. The rod N willhereinafter betermed an operating projection connected with thespace-bar. When the silent key D is depressed, the arm L will be rockedwith its cam-surface L, ed as to depress the levers J and the space-barI, and these parts will be locked in their lower position, so that whenthe key-lever D returns to its normal upper positionthe space-bar willnot be allowed to release the escapement for the feed of the carriage.Therefore when the next character is printed such character will come inthe same space as theaccent or other mark printed by the depression ofthe silent key.

It obviously is necessary that the escapement should be released as soonas one of the ordinary type-keys is depressed. For this purpose I havesecured to the rock-shaft M a releasing member which consists of a bar0, adapted to be engaged by the key-levers of the ordinary type-bars andsecured to said rock-shaft by arms 0'. This bar is rocked upward whenthe key-lever Dof a silent key N. The space-bar I will thus be released,and the customary feed movement of the carriage will take place when theordinary type-key returns to its normal position. Obviously thekey-levers D of the silent keys should be so arranged as to have noaction on the bar 0. This may be done in any suitable manner-forinstance, as shown in Fig. 2, by providing notches O in the bar 0 atthose places where a key-lever D of a silent key occurs. Thus whenever asilent key is depressed the space-bar will be looked in that positionwhich corresponds to the stationary position of the carriage, andwhenever thereupon one of the ordinary type-keys is depressed thespace-bar will be released, so as to allow the carriage to be fed in thecustomary manner.

The arm L (shown at the right in Fig. 2) is located beyond the end ofthe bar 0, and of course no notch O is required for this arm L.

Various modifications may be made without departing from the nature ofmy invention.

I claim-- .1. The combination with the silent key and its key-lever, ofa space-bar provided with an operating projection, a locking-arm adaptedto be operated by the depression of the silent key and arranged toengage said operating projection to lock the space-bar, and means forreleasing the space-bar.

2. The combination with the silent key and its key-leveigofa space-bar,an operating projection connected with said space-bar, looking mechanismadapted to be operated by the depression of the silent key and arrangedto engage said operating projection, and means for releasing thespace-bar.

3. The combination with the silent key,the space-bar provided with anoperating projection, a rock-shaft provided with an arm adapted to bemoved by the depression of the silent key and arranged to engage saidoperating projection to lock the space-bar, and means for releasing thespace-bar.

4. The combination with the silentkey,the space-bar provided with anoperating projection, a rock-shaft provided with an arm adapted to bemoved by the depression of the silent key and arranged to engage saidoperatin g projection to lock the space-bar, and a releasing memberconnected with said rockshaft and adapted to be engaged by the ordinarykey-levers.

5. The combination with the silent key, of 55 a space-key, a levercarrying the same, a device operated by the depression of the silent keyfor locking said lever directly, and adevice for releasing the space-keylever, operated by the depression of any one of the ordinary type-keys.

6. The combination with a silent key, of a space-key, a lever carryingthe same, and a device operated by the depression of the silent key forlocking said lever directly.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MILTON KELLOGG.

Witnesses:

A. G. ()LNEY, W. A. CHEEL.

